Piston ring



` Aug. 26, 19.30.

W. F. SHANNON PISTN `RING Find nec. 1o, 192e 2 Sheets-Sheet l* WITNESS:

, ATTORNEY ug.- 26, 1930.- w, F SHANNON 1,773,878

- Pls'roN RING y Fifled Das. 1o. '1928 shuts-sheet 2 ai' l ATTORNEY WITNESS:

` 2o corresponding Patented Aug. 26, 1930 UNiTi-:D Vs'rA'rlszs miam r. saumon, or autumn', um

Application lied December 10, 1828. Serial No. 314,927.

This invention relates to a piston ring, the general object of the invention being to provide a ring which will accommodate itself to worn grooves and to make the ring self-seating and also to provide the ring with an exterior oil groove and tapered walls adjacent the groove, whereby the ring will prevent compression leakage and oil leakage and properly seat itself in the groove even though 1o the walls of the grooveare worn.-

This invention also consists in certain other features of construction and inthe combination and arrangement of the several parts, to be hereinafter fully described, illustrated in z5 the accompanying drawings and specifically pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or arts throughout the several views, and in w ich v Figure 1 is a fragmentary view of a piston, showing the improved rings in use, portions or' one ring being shown in section.

Figure 2 is a section on line 2 2 of Figure 1, with parts in elevation.

Figure 3 1s a fragmentary bottom plan view of the outer or sealing ring.

Figure 4 is an enlarged sectional view through a portion of the cylinder and through the improved ring. 0

Figure 5 is a view of the expansion ring.

Figure 6 is a view of the inner or adjusting: section of the ring.

:i5 igure 7 is a view of the outer or sealing section of the ring.

Figure 8 is aview of one of the small springs'for pressing the sections apart.

As shown in these views, the ring A com- 40 prises an outer or sealing section 1, an inner or adjusting section 2 and an expansion rin 3 which is placed between the rear wall o the groove and the two sections and acts Vto expand the sections to hold the sections 1 5 against the wall of the cylinder. The section 1 is of right angular shape in cross section and the section 2 is of rectangular sha e in cross section, this section 2 fitting in t e space formed by the two parts of the section 5 1, as clearly shown in Figure 4.

A number of small springs 4 of substantially inverted V-shape have their vends'or limbs placed in the holes 5 formed in the upper edge of the section 2, withthe bight or looped portion of each spring 4 en agin 55 anyone of a numberl of recesses 6 orme in the under face of the to or horizontal part ofthe section 1, so that tliese springs 4tend to force the section 2 away from the toppart of the section 1. The recesses 6 are of differno ent depths, as clearly shown in Fi ure 1, so that by placingv each spring 4 in t e proper sized recess 6, thespace between the two sections can be adjusted and thus the two sections properly adjusted 'to the width of 65 groove in which they are placed. The sec-l tion 2 is referablyformed with a diagonally arrange joint 7, as shownv in Figure 6, and the .section 1 is preferably rovided with a ste pcd joint 8, as shown in igure 7.

7 e outer circumference of the section 1 is formed witha centrally arranged groove 9l andthe Wall above the groove slopes inwardly and upwardly' from the groove, as shown at 10, and the wall/below the groove slopes downwardly and outwardly from the groove, as shownat 11. Thus this outer face ofthe section 1 which engages the cylinder wall forms yan oil compression seal which lubricates the cylinder wall at all times and also 30 controls the oil on the upwardand downward strokes of the piston.v

vFrom the foregoing it will be seen't-hat the springs 4 act to hold the lower edge ofthe section 2 against the bottom wallof the ring 85 groove in the piston and the top face of the orizontal part of the-section 1 against the top Wall of the groove, thus making the ring V properly fitthe groove even though the walls of the groove have become worn. The ex- 90 pansion ring 3 tends to move the twosections outwardly. and thus holds ythe outer face of the section 1 against the cylinder wall so that the ring is oil-tight and compression-tight. As before stated, by providing recesses of 5 diiierent depths for the springs 4, the proper expansion of the two sections can he secured by placing the springs in the proper recesses. As shown, the groove 9 terminates short 100 of the ends of the section so that oil cannot escape from the ends of the groove.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claims.

\\'hat I claiin is:-

-l. A piston ring of the class described coinprising inner and outer sections, the inner section being of rectangular shape in cross section and the outer section beingr of rightangnlar shape in cross section with its horizontal part arranged over the inner section, springs of substantially inverted V-shape, the inner section having holes in its top for receiving the ends ofthe springs and the hori- Zontal part of the outer section having re ces-ses in its under face for receiving the looped )ortions of the springs, said recesses being ol different depths whereby the looped portions of the springs can be placed in a recess of the proper depth.

2. A piston ring of the class described coinprising inner and outer sections, the inner section being of rectangular shape in cross section and the outer section being of right angular shape in cross section with its horizontal part arranged over the inner section, springs of substantially inverted V-shape, the inner section having holes in its top for receiving the ends of the springs and the hori zonal part of the outer section having recesses 1n lts under face for receiving the looped portions of the springs, said recesses being of different depths whereby the looped portions of the springs can be placed in a recess of the proper depth, an expansion spring placed Abetween the two sections and the. rear wall of the groove, the outer circumference of the outer section having a centrally arranged groove therein, with that part of the outer face below the groove sloping upwardly and inwardl fro-m the groove and that part of the face below the groove sloping outwardly and downwardly from the groove, the inner section having a diagonally arranged joint and the outer section having a stepped joint.

In testimony whereof I aix my signature.

WARREN F. SHANNGN. 

